My father made me a clock using a Mason and Sullivan clock plans.  I think it was for a Boston Parlor clock, but I’m not sure.  The face has an 8 inch bezel/glass with a plastic retaining ring.  The plastic ring broke.  Is there a replacement for the bezel, either like the original or a suitable replacement?  The bezel has a small bar and two threaded prongs that hold the bezel to the clock via a couple of small nuts on the inside of the clock, and the plastic ring holds the small bar and pivot points against the metal bezel.  Any help would be greatly appreciated!